Selected Quarterly Data (Schedule Of Selected Quarterly Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended										12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016		Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Quarterly Data [Line Items]
Operating Revenues	$ 2,096		$ 2,263	$ 2,133	$ 2,592	$ 2,090		$ 2,450	$ 1,905	$ 2,616	$ 9,084	$ 9,061	$ 10,415
Operating Income (Loss)	362		693	196	178	(175)		577	347	827	1,429	1,576	2,962
Net Income (Loss)	$ 956	[1]	$ 395	$ 109	$ 114	$ (98)	[1]	$ 327	$ 187	$ 471
Net Income (Loss)											$ 1,574	$ 887	$ 1,679
Basic	505		505	505	505	505		505	505	505	505	505	505
Diluted	508		507	507	508	508		508	508	508	507	508	508
Earnings Per Share, Basic	$ 1.89		$ 0.78	$ 0.22	$ 0.23	$ (0.19)		$ 0.65	$ 0.37	$ 0.93	$ 3.12	$ 1.76	$ 3.32
Earnings Per Share, Diluted	$ 1.88		$ 0.78	$ 0.22	$ 0.22	$ (0.19)		$ 0.64	$ 0.37	$ 0.93	$ 3.10	$ 1.75	$ 3.30
PSE&G [Member]
Schedule of Quarterly Data [Line Items]
Operating Revenues	$ 1,545		$ 1,509	$ 1,368	$ 1,812	$ 1,475		$ 1,684	$ 1,350	$ 1,712	$ 6,234	$ 6,221	$ 6,636
Operating Income (Loss)	393		459	379	521	369		450	333	462	1,752	1,614	1,462
Net Income (Loss)	220		246	208	299	193		255	179	262
Net Income (Loss)											973	889	787
Power [Member]
Schedule of Quarterly Data [Line Items]
Operating Revenues	844		873	929	1,284	921		1,075	714	1,313	3,930	4,023	4,928
Operating Income (Loss)	(82)		213	(187)	(303)	(556)		238	(12)	343	(359)	13	1,430
Net Income (Loss)	$ 610	[1]	$ 136	$ (97)	$ (170)	$ (302)	[1]	$ 139	$ (11)	$ 192
Net Income (Loss)											$ 479	$ 18	$ 856

[1] The increases in Operating Income at PSEG consolidated and Power in the fourth quarter 2017 as compared to the same quarter in 2016 were primarily due to higher costs in 2016 related to closing the coal/gas Hudson and Mercer units, which were fully depreciated as of June 1, 2017. The increases in Net Income at PSEG consolidated and Power in the fourth quarter 2017 as compared to the same quarter in 2016 also includes the impact of the remeasurement of deferred tax balances resulting from the enactment of new tax legislation in December 2017. See Note 20. Income Taxes for additional information.